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主题:Android、iPhone和Java三个平台一致的加密工具
先前一直在做安卓,最近要开发iPhone客户端,这其中遇到的最让人纠结的要属Java、Android和iPhone三个平台加解密不一致的问题。因为手机端后台通常是用JAVA开发的Web Service,Android和iPhone客户端调用同样的Web Service接口,为了数据安全考虑,要对数据进行加密。头疼的问题就来了,很难编写出一套加密程序,在3个平台间加解密的结果一致,总不能为Android和iPhone两个客户端各写一套Web Service接口吧?我相信还会有很多朋友为此困惑,在此分享一套3DES加密程序,能够实现Java、Android和iPhone三个平台加解密一致。
首先是JAVA端的加密工具类,它同样适用于Android端,无需任何修改,即可保证Java与Android端的加解密一致,并且中文不会乱码。
- package org.liuyq.des3;
- import java.security.Key;
- import javax.crypto.Cipher;
- import javax.crypto.SecretKeyFactory;
- import javax.crypto.spec.DESedeKeySpec;
- import javax.crypto.spec.IvParameterSpec;
- /**
- * 3DES加密工具类
- *
- * @author liufeng
- * @date 2012-10-11
- */
- public class Des3 {
- // 密钥
- private final static String secretKey = "liuyunqiang@lx100$#365#$";
- // 向量
- private final static String iv = "01234567";
- // 加解密统一使用的编码方式
- private final static String encoding = "utf-8";
- /**
- * 3DES加密
- *
- * @param plainText 普通文本
- * @return
- * @throws Exception
- */
- public static String encode(String plainText) throws Exception {
- Key deskey = null;
- DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
- SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
- deskey = keyfactory.generateSecret(spec);
- Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
- IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
- cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
- byte[] encryptData = cipher.doFinal(plainText.getBytes(encoding));
- return Base64.encode(encryptData);
- }
- /**
- * 3DES解密
- *
- * @param encryptText 加密文本
- * @return
- * @throws Exception
- */
- public static String decode(String encryptText) throws Exception {
- Key deskey = null;
- DESedeKeySpec spec = new DESedeKeySpec(secretKey.getBytes());
- SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
- deskey = keyfactory.generateSecret(spec);
- Cipher cipher = Cipher.getInstance("desede/CBC/PKCS5Padding");
- IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
- cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
- byte[] decryptData = cipher.doFinal(Base64.decode(encryptText));
- return new String(decryptData, encoding);
- }
- }
上面的加密工具类会使用到Base64这个类,该类的源代码如下:
- package org.liuyq.des3;
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
- import java.io.OutputStream;
- /**
- * Base64编码工具类
- *
- * @author liufeng
- * @date 2012-10-11
- */
- public class Base64 {
- private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
- public static String encode(byte[] data) {
- int start = 0;
- int len = data.length;
- StringBuffer buf = new StringBuffer(data.length * 3 / 2);
- int end = len - 3;
- int i = start;
- int n = 0;
- while (i <= end) {
- int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 0x0ff) << 8) | (((int) data[i + 2]) & 0x0ff);
- buf.append(legalChars[(d >> 18) & 63]);
- buf.append(legalChars[(d >> 12) & 63]);
- buf.append(legalChars[(d >> 6) & 63]);
- buf.append(legalChars[d & 63]);
- i += 3;
- if (n++ >= 14) {
- n = 0;
- buf.append(" ");
- }
- }
- if (i == start + len - 2) {
- int d = ((((int) data[i]) & 0x0ff) << 16) | ((((int) data[i + 1]) & 255) << 8);
- buf.append(legalChars[(d >> 18) & 63]);
- buf.append(legalChars[(d >> 12) & 63]);
- buf.append(legalChars[(d >> 6) & 63]);
- buf.append("=");
- } else if (i == start + len - 1) {
- int d = (((int) data[i]) & 0x0ff) << 16;
- buf.append(legalChars[(d >> 18) & 63]);
- buf.append(legalChars[(d >> 12) & 63]);
- buf.append("==");
- }
- return buf.toString();
- }
- private static int decode(char c) {
- if (c >= ‘A‘ && c <= ‘Z‘)
- return ((int) c) - 65;
- else if (c >= ‘a‘ && c <= ‘z‘)
- return ((int) c) - 97 + 26;
- else if (c >= ‘0‘ && c <= ‘9‘)
- return ((int) c) - 48 + 26 + 26;
- else
- switch (c) {
- case ‘+‘:
- return 62;
- case ‘/‘:
- return 63;
- case ‘=‘:
- return 0;
- default:
- throw new RuntimeException("unexpected code: " + c);
- }
- }
- /**
- * Decodes the given Base64 encoded String to a new byte array. The byte array holding the decoded data is returned.
- */
- public static byte[] decode(String s) {
- ByteArrayOutputStream bos = new ByteArrayOutputStream();
- try {
- decode(s, bos);
- } catch (IOException e) {
- throw new RuntimeException();
- }
- byte[] decodedBytes = bos.toByteArray();
- try {
- bos.close();
- bos = null;
- } catch (IOException ex) {
- System.err.println("Error while decoding BASE64: " + ex.toString());
- }
- return decodedBytes;
- }
- private static void decode(String s, OutputStream os) throws IOException {
- int i = 0;
- int len = s.length();
- while (true) {
- while (i < len && s.charAt(i) <= ‘ ‘)
- i++;
- if (i == len)
- break;
- int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6) + (decode(s.charAt(i + 3)));
- os.write((tri >> 16) & 255);
- if (s.charAt(i + 2) == ‘=‘)
- break;
- os.write((tri >> 8) & 255);
- if (s.charAt(i + 3) == ‘=‘)
- break;
- os.write(tri & 255);
- i += 4;
- }
- }
- }
接下来是iPhone端的加密程序,当然是用Ojbective-C写的3DES加密程序,源代码如下:
- //
- // DES3Util.h
- // lx100-gz
- //
- // Created by 柳峰 on 12-10-10.
- // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved.
- //
- #import <Foundation/Foundation.h>
- @interface DES3Util : NSObject {
- }
- // 加密方法
- + (NSString*)encrypt:(NSString*)plainText;
- // 解密方法
- + (NSString*)decrypt:(NSString*)encryptText;
- @end
- //
- // DES3Util.m
- // lx100-gz
- //
- // Created by 柳峰 on 12-9-17.
- // Copyright 2012 http://blog.csdn.net/lyq8479. All rights reserved.
- //
- #import "DES3Util.h"
- #import <CommonCrypto/CommonCryptor.h>
- #import "GTMBase64.h"
- #define gkey @"liuyunqiang@lx100$#365#$"
- #define gIv @"01234567"
- @implementation DES3Util
- // 加密方法
- + (NSString*)encrypt:(NSString*)plainText {
- NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];
- size_t plainTextBufferSize = [data length];
- const void *vplainText = (const void *)[data bytes];
- CCCryptorStatus ccStatus;
- uint8_t *bufferPtr = NULL;
- size_t bufferPtrSize = 0;
- size_t movedBytes = 0;
- bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);
- bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));
- memset((void *)bufferPtr, 0x0, bufferPtrSize);
- const void *vkey = (const void *) [gkey UTF8String];
- const void *vinitVec = (const void *) [gIv UTF8String];
- ccStatus = CCCrypt(kCCEncrypt,
- kCCAlgorithm3DES,
- kCCOptionPKCS7Padding,
- vkey,
- kCCKeySize3DES,
- vinitVec,
- vplainText,
- plainTextBufferSize,
- (void *)bufferPtr,
- bufferPtrSize,
- &movedBytes);
- NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes];
- NSString *result = [GTMBase64 stringByEncodingData:myData];
- return result;
- }
- // 解密方法
- + (NSString*)decrypt:(NSString*)encryptText {
- NSData *encryptData = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]];
- size_t plainTextBufferSize = [encryptData length];
- const void *vplainText = [encryptData bytes];
- CCCryptorStatus ccStatus;
- uint8_t *bufferPtr = NULL;
- size_t bufferPtrSize = 0;
- size_t movedBytes = 0;
- bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1);
- bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t));
- memset((void *)bufferPtr, 0x0, bufferPtrSize);
- const void *vkey = (const void *) [gkey UTF8String];
- const void *vinitVec = (const void *) [gIv UTF8String];
- ccStatus = CCCrypt(kCCDecrypt,
- kCCAlgorithm3DES,
- kCCOptionPKCS7Padding,
- vkey,
- kCCKeySize3DES,
- vinitVec,
- vplainText,
- plainTextBufferSize,
- (void *)bufferPtr,
- bufferPtrSize,
- &movedBytes);
- NSString *result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr
- length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding] autorelease];
- return result;
- }
- @end
iPhone端的加密工具类中引入了“GTMBase64.h”,这是iOS平台的Base64编码工具类,就不在这里贴出相关代码了,需要的百度一下就能找到,实在找不到就回复留言给我。
好了,赶紧试一下吧,JAVA,Android和iPhone三个平台的加密不一致问题是不是解决了呢?其实,对此问题,还有一种更好的实现方式,那就是用C语言写一套加密程序,这样在iOS平台是可以直接使用C程序的,而在Java和Android端通过JNI去调用C语言编写的加密方法,这是不是就实现了3个平台调用同一套加密程序呢?
主题:Android、iPhone和Java三个平台一致的加密工具